期刊
ENERGY AND BUILDINGS
卷 42, 期 10, 页码 1703-1710出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2010.04.013
关键词
Thermal stratification; Thermal energy storage; Solar heating systems; Multi-tank; Solar hot water; Storage heat loss
资金
- Canadian Solar Buildings Research Network
- Natural Science and Engineering Research Council of Canada
- EnerWorks Inc.
It is common practice to predict the performance of solar domestic hot water (SDHW) systems by computer simulation. This process relies on the accurate specification of the system's physical and thermal characteristics, and is often based on a number of simplifying assumptions. An important aspect of system performance is storage heat loss characteristics: however, these are often represented by an average heat loss coefficient or U-value that does not account for the complex geometry of the thermal storage or the interaction of the various inlet and outlet ports that may act as thermal conduits. In addition, most solar storage models assume that the tank temperature profile is one-dimensional and that conduction within the tank wall is negligible. To investigate these effects, tests were conducted on a typical thermal storage used in SDHW applications and included a cool-down test and a heat diffusion test sequence. The values derived from these test sequences were then compared to computer predictions based on estimated thermal properties. In addition, the basic assumptions typically used in the computer modelling of solar storage heat losses (e.g., one-dimensional temperature profiles, minimal tank wall conduction, uniform wall heat loss) were investigated, particularly in the context of a thermally stratified thermal storage. (C) 2010 Elsevier B.V. All rights reserved.
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